/* 代码块高亮 */
pre {
  position: relative;
  margin-bottom: 24px;
  border-radius: 3px;
  border: 1px solid #c3ccd0;
  background: #fff;
  overflow: hidden;
}
code {
  display: block;
  padding: 12px 24px;
  overflow-y: auto;
  font-weight: 300;
  font-family: Menlo, monospace;
}
code.has-numbering {
  margin-left: 21px;
}
.pre-numbering {
  position: absolute;
  top: 0;
  left: 0;
  width: 20px;
  padding: 12px 2px 12px 0;
  border-right: 1px solid #c3ccd0;
  border-radius: 3px 0 0 3px;
  background-color: #eee;
  text-align: right;
  font-family: Menlo, monospace;
  font-size: 0.8em;
  color: #aaa;
}
